2011/09/06

Rev.A.3

1

EM8800A

Constant Off Time, Current-Mode Controller for LED Applications

General Description

EM8800A is a constant off time current mode

controller. This device can operated with a fixed off

time of the power switch. The TOFF pin is provided

to set the off time. In addition, the PWMD pin

enables the user to use a PWM signal to modulate

the switching pattern and adjust the average

luminosity. The LD/SS pin enables the user to set

peak current by adjust the voltage of this pin.

This part includes internal soft start, maximum

on time protection, over current protection and

thermal shutdown function. This part is available in

SOP-8 package.

Ordering Information

Part Number

Package

Remark

EM8800AG

SOP-8

Features

Constant Off Time Current-Mode Control

Adjustable Off Time

Internal Leading Edge Blanking

Internal Start Up Delay

Maximum On Time Protection

Over Current Protection

Thermal Shutdown

Applications

LED Backlight or lighting

RGB Backlight or lighting

Organic Light-Emitting Diode Backlight or

lighting

AC-DC or DC-DC LED Driver applications.

Pin Configuration

Typical Application Circuit

EM8800A

TOFF

G D

CS

GATE

VCC

VLED-in

LD/SS

PWMD

FAULT